从纬度和经度坐标数组列表向 google 地图添加多个标记

Question

目前我有一个应用程序可以在后台获取手机的 GPS 位置并将经度和纬度坐标添加到两个单独的数组列表中，我知道这部分工作正常，但是当我点击按钮绘制指向我的地图，当我的数组列表中有数百个时，它只绘制第一个点

btnPrevious.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


            for(int i = 0;i<latitude.size();i++)
            {
                mMap.addMarker(new MarkerOptions().position(new LatLng(latitude.get(i), longitude.get(i))).title("LOCATION " + latitude.get(i) + ", " + longitude.get(i)));

                Log.d("LOCATION", latitude.get(i)+ "," + longitude.get(i));


            }
            Log.d("Count", ""+longitude.size());


        }
    });

Answer 1

试试这个代码，我正在获取数据列表 class，其中包含我在标记选项中设置的纬度和经度信息以显示在地图上。如果你想为相机设置动画，你可以将构建器实例传递给 animateCamera，地图将为你添加所有已添加标记的动画。

private void insertMarkers(List<Data> list) {
        final LatLngBounds.Builder builder = new LatLngBounds.Builder();

        for (int i = 0; i < list.size(); i++) {
            final Lat Lng position = new LatLng(list.get(i).getCurrent_lat(), list.get(i).getCurrent_lng());
            final MarkerOptions options = new MarkerOptions().position(position);

            mMaps.addMarker(options);

            builder.include(position);
        }

    }

Answer 2

我这样做是为了在地图上用不同颜色的标记显示电机位置：

private void addMarkersToMap() {
mMap.clear();
for (int i = 0; i < Motors.size(); i++) {         
        LatLng ll = new LatLng(Motors.get(i).getPos().getLat(), Motors.get(i).getPos().getLon());
        BitmapDescriptor bitmapMarker;
        switch (Motors.get(i).getState()) {
        case 0:
            bitmapMarker = BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED);
            Log.i(TAG, "RED");
            break;
        case 1:
            bitmapMarker = BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN);
            Log.i(TAG, "GREEN");
            break;
        case 2:
            bitmapMarker = BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE);
            Log.i(TAG, "ORANGE");
            break;
        default:
            bitmapMarker = BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED);
            Log.i(TAG, "DEFAULT");
            break;
        }               
        mMarkers.add(mMap.addMarker(new MarkerOptions().position(ll).title(Motors.get(i).getName())
                .snippet(getStateString(Motors.get(i).getState())).icon(bitmapMarker)));

        Log.i(TAG,"Car number "+i+"  was added " +mMarkers.get(mMarkers.size()-1).getId());
    }
}

}

Motors 是自定义对象的 ArrayList，mMarkers 是标记的 ArrayList。

注意：您可以像这样在片段中显示地图：

private GoogleMap mMap;

.....

private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the
// map.
if (mMap == null) {
    // Try to obtain the map from the SupportMapFragment.
    mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
    // Check if we were successful in obtaining the map.
    if (mMap != null) {
        setUpMap();
    }
}

}

private void setUpMap() {
// Hide the zoom controls as the button panel will cover it.
mMap.getUiSettings().setZoomControlsEnabled(false);

// Add lots of markers to the map.
addMarkersToMap();

// Setting an info window adapter allows us to change the both the
// contents and look of the
// info window.
mMap.setInfoWindowAdapter(new CustomInfoWindowAdapter());

// Set listeners for marker events. See the bottom of this class for
// their behavior.
mMap.setOnMarkerClickListener(this);
mMap.setOnInfoWindowClickListener(this);
mMap.setOnMarkerDragListener(this);

// Pan to see all markers in view.
// Cannot zoom to bounds until the map has a size.
final View mapView = getSupportFragmentManager().findFragmentById(R.id.map).getView();
if (mapView.getViewTreeObserver().isAlive()) {
    mapView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        @SuppressLint("NewApi")
        // We check which build version we are using.
        @Override
        public void onGlobalLayout() {
            LatLngBounds.Builder bld = new LatLngBounds.Builder();
for (int i = 0; i < mAvailableCars.size(); i++) {           
        LatLng ll = new LatLng(Cars.get(i).getPos().getLat(), Cars.get(i).getPos().getLon());
        bld.include(ll);            
}
LatLngBounds bounds = bld.build();          
mMap.moveCamera(CameraUpdateFactory.newLatLngBounds(bounds, 70));
            mapView.getViewTreeObserver().removeGlobalOnLayoutListener(this);

        }
    });
}
}

然后在 onCreate() 中调用 setUpMapIfNeeded()

从纬度和经度坐标数组列表向 google 地图添加多个标记

Adding multiple markers to google map from array list of latitude and longitude coordinates

android

google-maps

google-maps-markers